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Upstream Oxygen Sensor The input from the upstream heated oxygen sensor tells the Engine Control Module (ECM) the oxygen content of the Downstream Oxygen Sensor The downstream heated oxygen sensor signal is used to detect catalytic convertor deterioration. As the convertor Removal & Installation - Upstream Oxygen Sensor 1. Disconnect the negative battery cable. 2. Disconnect the oxygen sensor electrical connector. CAUTION: 3. Remove the upstream oxygen sensor (1). (Tighten: Upstream oxygen sensor to 45 N·m) 4. Installation is in the reverse order of removal. Installation Notes: Removal & Installation - Downstream Oxygen Sensor 1. Disconnect the negative battery cable. 2. Disconnect the oxygen sensor electrical connector. CAUTION: 3. Remove the downstream oxygen sensor (2). (Tighten: Downstream oxygen sensor to 45 N·m) ON-VEHICLE SERVICE BESM030017 BESM030017 03
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